Image pick-up module transmission arrangement for a scanner

Details Image pick-up module transmission arrangement for a scanner Image pick-up module transmission arrangement for a scanner

1998-08-17

2001-01-23

Grant, II, Jerome (Department: 2724)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S296000, C358S409000, C358S411000, C358S505000

Reexamination Certificate

active

06178013

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a scanner, and more specifically to an image pick-up module transmission arrangement for a scanner which enables the image pick-up module to be stably smoothly reciprocated in the scanning path to positively pick up the image of document up.
Scanners have been intensively used with computers in offices for text and graphic document data input. A regular scanner for this purpose is generally comprised of a transparent glass, an image pick-up module, a transmission mechanism, an electronic control circuit, a power supply unit, and a machine base. During the operation of a scanner, the light path must be maintained stable so that the image of document can be positively picked up by the image pick-up module. If the light path is not maintained stable, image distortion becomes inevitable. To a high resolution scanner of CIS (contact image sensor) type scanner, the requirement for a stable light path is critical.
FIG. 1
shows an image pick-up module transmission arrangement for a scanner according to the prior art. According to this arrangement, the image pick-up module is driven to move back and forth in the scanning path by a motor drive through a belt transmission mechanism. Because the belt transmission mechanism produces vibration when the motor drive is started, the reciprocating motion of the image pick-up module which is unstable may affect the scanning quality. Furthermore, because the belt transmission mechanism is mounted in the machine base, the outer shell of the scanner tends to be put out of shape due to change of ambient temperature and humility. When the outer shell of the scanner is deformed, the light path becomes unstable, in consequence the scanning quality is affected.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide an image pick-up transmission module which eliminates the aforesaid problems. According to the present invention, the top cover of the scanner holds a transparent glass above the scanning path and two racks along two opposite sides of the scanning path, the image pick-up module is supported on two guide rails, which are bilaterally fixedly fastened to the top cover at the bottom of the scanning path, and a transmission shaft is revolvably mounted in the image pick-up module, and coupled to the racks by gear wheels. The gear wheels are rotated clockwise/counter-clockwise by a power drive in the image pick-up module, causing the image pick-up module to be reciprocated in the scanning path along the guide rails. Because the top cover of the scanner is stretched by the transparent glass, ambient temperature and humility changes do not deform the top cover easily. Furthermore, because the image pick-up module is reciprocated in the scanning path by means of rotating the gear wheels along the racks, the reciprocating motion of the image pick-up module is stable, and little noise or vibration is produced during the reciprocating motion of the image pick-up module.


REFERENCES:
patent: 4779141 (1988-10-01), Wantanabe
patent: 5311015 (1994-05-01), Takeuchi
patent: 5610720 (1997-03-01), Fujioka et al.
patent: 5717503 (1998-02-01), Chien
patent: 5845180 (1998-12-01), Tsai

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